Move apps/shell to extensions/shell.

apps/shell/common/api/_api_features.json

Index: apps/shell/common/api/_api_features.json
diff --git a/apps/shell/common/api/_api_features.json b/apps/shell/common/api/_api_features.json
deleted file mode 100644
index 9571ca8f5e8c6da2006dc0214b43080cc4837dbb..0000000000000000000000000000000000000000
--- a/apps/shell/common/api/_api_features.json
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This features file defines extension APIs implemented under src/apps/shell.
-// See extensions/common/features/* to understand this file, in particular
-// feature.h, simple_feature.h, and base_feature_provider.h.
-//
-// Note that specifying "web_page", "blessed_web_page", or "all" as a context
-// type will require manually updating chrome/renderer/resources/dispatcher.cc.
-
-{
-  "shell": {
-    "channel": "dev",
-    "contexts": ["blessed_extension"],
-    "extension_types": ["platform_app"]
-  }
-}